LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Risk-Rated and Non-Risk Rated Loans by Grade and Other Characteristic) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 9,947,697	$ 9,870,982
Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	39,237	251,023
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	243,932	188,312
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	199,655	159,857
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	149,726	127,251
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	102,880	104,043
Prior	304,771	242,453
Revolving Loans	5,455	3,528
Total Loans	1,045,656	1,076,467
Loans receivable	1,045,656	1,076,467
Commercial real estate - investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	41,603	257,365
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	266,624	276,673
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	272,317	319,804
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	305,839	254,328
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	262,974	304,105
Prior	762,447	523,347
Revolving Loans	20,001	20,062
Total Loans	1,931,805	1,955,684
Loans receivable	1,931,805	1,955,684
Small balance CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	16,636	56,544
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	86,223	80,090
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	83,030	84,749
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	89,631	78,249
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	84,530	68,791
Prior	278,221	202,876
Revolving Loans	1,059	2,550
Total Loans	639,330	573,849
Loans receivable	639,330	573,849
Multifamily Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	16,005	80,944
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	78,557	71,253
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	72,501	39,343
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	37,683	93,442
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	93,037	44,395
Prior	133,912	96,863
Revolving Loans	2,080	1,983
Total Loans	433,775	428,223
Loans receivable	433,775	428,223
Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,689	96,419
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	94,483	76,923
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	52,477	46,172
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	43,431	6,038
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	332	2,256
Prior	625	1,129
Revolving Loans	0	0
Total Loans	199,037	228,937
Loans receivable	199,037	228,937
Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	26,801	79,710
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	84,144	151,141
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	128,336	59,744
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	51,514	14,932
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	14,899	0
Prior	0	0
Revolving Loans	0	0
Total Loans	305,694	305,527
Loans receivable	305,694	305,527
One- to four- family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	204,530	463,358
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	324,068	36,241
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	10,705	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	3,537	8,211
Total Loans	542,840	507,810
Loans receivable	542,840	507,810
Land and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	266,730	248,915
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	442,729	1,250,003
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,107,651	245,670
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	219,333	221,620
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	209,787	71,577
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	67,800	40,077
Prior	101,983	66,774
Revolving Loans	227,311	282,740
Total Loans	2,376,594	2,178,461
Loans receivable	2,376,594	2,178,461
Small business scored
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	36,426	157,461
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	149,455	145,474
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	134,928	127,691
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	115,997	91,081
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	79,690	48,082
Prior	100,690	63,948
Revolving Loans	100,316	109,714
Total Loans	717,502	743,451
Loans receivable	717,502	743,451
Agricultural business, including secured by farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	12,322	33,574
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	31,761	64,710
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	58,051	32,457
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	30,018	23,608
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	21,160	23,069
Prior	46,202	28,536
Revolving Loans	62,896	93,995
Total Loans	262,410	299,949
Loans receivable	262,410	299,949
One- to four- family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	16,175	106,462
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	114,130	90,539
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	81,582	94,738
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	79,530	102,776
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	82,961	60,907
Prior	278,509	259,353
Revolving Loans	2,740	3,164
Total Loans	655,627	717,939
Loans receivable	655,627	717,939
Consumer—home equity revolving lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	8,652	10,522
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,216	3,131
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,523	2,751
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,285	3,923
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,720	1,658
Prior	3,637	2,696
Revolving Loans	443,099	467,131
Total Loans	466,132	491,812
Consumer secured by one- to four-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	466,132	491,812
Consumer-other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,738	22,101
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	19,754	13,412
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	11,576	13,951
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12,392	11,488
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	9,933	8,642
Prior	24,202	18,842
Revolving Loans	23,970	25,522
Total Loans	104,565	113,958
Land and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	53,534	156,464
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	141,089	37,427
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26,208	19,607
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12,145	6,991
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,754	6,264
Prior	10,249	5,142
Revolving Loans	16,751	17,020
Total Loans	266,730	248,915
Pass \| Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	39,192	243,100
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	236,836	156,838
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	158,294	156,817
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	147,397	122,484
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	98,352	92,312
Prior	266,316	212,792
Revolving Loans	5,455	3,379
Total Loans	951,842	987,722
Pass \| Commercial real estate - investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	41,181	237,553
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	238,095	262,543
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	260,934	299,452
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	284,975	218,018
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	226,762	278,348
Prior	711,557	502,914
Revolving Loans	20,001	20,062
Total Loans	1,783,505	1,818,890
Pass \| Multifamily Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	16,005	78,632
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	76,245	69,825
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	71,073	39,343
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	37,683	93,442
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	93,037	44,395
Prior	133,912	96,863
Revolving Loans	2,080	1,983
Total Loans	430,035	424,483
Pass \| Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	4,182	83,506
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	94,483	67,152
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	42,572	41,299
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	38,566	6,038
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	332	2,158
Prior	527	1,129
Revolving Loans	0	0
Total Loans	180,662	201,282
Pass \| Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	26,801	79,710
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	84,144	151,141
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	128,336	59,744
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	51,514	14,932
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	14,899	0
Prior	0	0
Revolving Loans	0	0
Total Loans	305,694	305,527
Pass \| One- to four- family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	204,174	461,294
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	324,068	35,910
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	10,374	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	3,537	7,581
Total Loans	542,153	504,785
Pass \| Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	440,419	1,243,276
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,103,935	230,845
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	211,237	203,051
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	191,647	65,524
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	62,188	38,757
Prior	100,296	66,206
Revolving Loans	211,777	264,741
Total Loans	2,321,499	2,112,400
Pass \| Agricultural business, including secured by farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	12,322	32,032
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	31,316	62,058
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	55,503	31,381
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	29,215	22,635
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	20,206	22,394
Prior	44,027	24,950
Revolving Loans	61,005	91,660
Total Loans	253,594	287,110
Pass \| Land and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	50,665	156,450
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	141,075	37,397
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26,180	16,560
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12,004	6,801
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,567	6,264
Prior	10,249	4,840
Revolving Loans	16,751	17,020
Total Loans	263,491	245,332
Special Mention \| Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	4,560
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	16,835	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	2,251
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,217	0
Prior	87	1,869
Revolving Loans	0	149
Total Loans	19,139	8,829
Special Mention \| Commercial real estate - investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	2,712
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	2,730
Prior	11,079	1,856
Revolving Loans	0	0
Total Loans	11,079	7,298
Special Mention \| Multifamily Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Special Mention \| Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	5,963
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	5,967	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	5,967	5,963
Special Mention \| Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Special Mention \| One- to four- family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	1,563
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	630
Total Loans	0	2,193
Special Mention \| Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	75	103
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	96	412
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,184	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	829
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	752	0
Prior	104	115
Revolving Loans	10,487	9,507
Total Loans	14,698	10,966
Special Mention \| Agricultural business, including secured by farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	810
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	810	0
Prior	0	537
Revolving Loans	0	0
Total Loans	810	1,347
Special Mention \| Land and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Substandard \| Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	45	7,923
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,096	26,914
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	24,526	3,040
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,329	2,516
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,311	11,731
Prior	38,368	27,792
Revolving Loans	0	0
Total Loans	74,675	79,916
Substandard \| Commercial real estate - investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	422	19,812
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	28,529	11,418
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	11,383	20,352
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	20,864	36,310
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	36,212	23,027
Prior	39,811	18,577
Revolving Loans	0	0
Total Loans	137,221	129,496
Substandard \| Multifamily Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	2,312
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,312	1,428
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,428	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	3,740	3,740
Substandard \| Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	3,507	12,913
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	3,808
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,938	4,873
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,865	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	98
Prior	98	0
Revolving Loans	0	0
Total Loans	12,408	21,692
Substandard \| Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Substandard \| One- to four- family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	356	501
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	331
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	331	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	687	832
Substandard \| Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,235	6,624
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,620	14,413
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,912	18,569
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	18,140	5,224
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,860	1,320
Prior	1,583	453
Revolving Loans	5,047	8,492
Total Loans	40,397	55,095
Substandard \| Agricultural business, including secured by farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	1,542
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	445	2,652
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,548	1,076
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	803	163
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	144	675
Prior	2,175	3,049
Revolving Loans	1,891	2,335
Total Loans	8,006	11,492
Substandard \| Land and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,869	14
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14	30
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	28	3,047
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	141	190
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	187	0
Prior	0	302
Revolving Loans	0	0
Total Loans	3,239	3,583
Doubtful \| Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| Commercial real estate - investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| Multifamily Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| One- to four- family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Total Loans	0	0
Doubtful \| Agricultural business, including secured by farmland

LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Risk-Rated and Non-Risk Rated Loans by Grade and Other Characteristic) (Details) - USD ($)
$ in Thousands